Method and apparatus for transmitting a plurality of uplink control information on a physical uplink control channel in a wireless communication system

ABSTRACT

The present specification provides a method for transmitting multiple uplink control information (UCI) on a physical uplink control channel (PUCCH) in a wireless communication system. More specifically, the method performed by a user equipment (UE) includes receiving, from a base station, control information related to PUCCH resources for transmitting the multiple UCI, wherein the control information includes information related to a number of REs of the PUCCH resources, information related to a modulation order, and information related to a configured maximum code rate; determining a PUCCH resource for transmitting the multiple UCI by comparing a value obtained by multiplying the configured maximum code rate and the modulation order by the number of REs corresponding to the PUCCH resources indexed in ascending order with a size of a payload for the multiple UCI; and transmitting, to the base station, the multiple UCI on the determined PUCCH resource.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application is a continuation of U.S. application Ser. No.16/254,228, filed on Jan. 22, 2019, which claims priority to U.S.Provisional Application No. 62/620,410 filed on Jan. 22, 2018, theentire contents of which are hereby incorporated by reference in theirentirety.

BACKGROUND OF THE INVENTION Field of the invention

The present specification relates to a wireless communication system,and more particularly to a method for transmitting multiple uplinkcontrol information on a physical uplink control channel and a devicesupporting the same.

Description of the Related Art

A mobile communication system has been developed to provide a voiceservice while ensuring an activity of a user. However, in the mobilecommunication system, not only a voice but also a data service isextended. At present, due to an explosive increase in traffic, there isa shortage of resources and users demand a higher speed service, and asa result, a more developed mobile communication system is required.

Requirements of a next-generation mobile communication system should beable to support acceptance of explosive data traffic, a dramaticincrease in per-user data rate, acceptance of a significant increase inthe number of connected devices, very low end-to-end latency, andhigh-energy efficiency. To this end, various technologies areresearched, which include dual connectivity, massive multiple inputmultiple output (MIMO), in-band full duplex, non-orthogonal multipleaccess (NOMA), super wideband support, device networking, and the like.

SUMMARY OF THE INVENTION

An object of the present specification is to provide a method fortransmitting multiple uplink control information (UCI) on a physicaluplink control channel (PUCCH).

Another object of the present specification is to provide a method fordetermining for a PUCCH resource for transmitting UCI based oninformation about a number of REs related to the PUCCH resources, amaximum code rate, a modulation order, and the like.

Technical problems to be solved by the present invention are not limitedby the above-mentioned technical problems, and other technical problemswhich are not mentioned above can be clearly understood from thefollowing description by those skilled in the art to which the presentinvention pertains.

The present specification provides a method for transmitting multipleuplink control information (UCI) on a physical uplink control channel(PUCCH) in a system.

More specifically, the method performed by a user equipment (UE)comprises receiving, from a base station, control information related toPUCCH resources for transmitting the multiple UCI, wherein the controlinformation includes information related to a number of REs of the PUCCHresources, information related to a modulation order, and informationrelated to a configured maximum code rate; determining a PUCCH resourcefor transmitting the multiple UCI by comparing a value obtained bymultiplying the configured maximum code rate and the modulation order bythe number of REs corresponding to the PUCCH resources indexed inascending order with a size of a payload for the multiple UCI; andtransmitting, to the base station, the multiple UCI on the determinedPUCCH resource.

In the present specification, the determining of the PUCCH resourcecomprises determining, as the PUCCH resource for transmitting themultiple UCI, a PUCCH resource with a lowest index among PUCCH resourcescorresponding to the number of REs having a value equal to or greaterthan the size of the payload for the multiple UCI among values obtainedby multiplying the configured maximum code rate and the modulation orderby the number of REs corresponding to the PUCCH resources indexed in theascending order.

In the present specification, the control information further includes aPUCCH format of the PUCCH resources, and the maximum code rate isdetermined by the PUCCH format.

In the present specification, the determining of the PUCCH resourcecomprises determining the PUCCH resource based on the maximum code rateor the PUCCH format, when the PUCCH resource with the lowest index amongthe PUCCH resources corresponding to the number of REs having the valueequal to or greater than the size of the payload for the multiple UCIamong the values obtained by multiplying the configured maximum coderate and the modulation order by the number of REs corresponding to thePUCCH resources indexed in the ascending order is in plural.

In the present specification, the determining of the PUCCH resourcecomprises determining the PUCCH resources based on the PUCCH format,when the PUCCH resource with the lowest index among the PUCCH resourcescorresponding to the number of REs having the value equal to or greaterthan the size of the payload for the multiple UCI among the valuesobtained by multiplying the configured maximum code rate and themodulation order by the number of REs corresponding to the PUCCHresources indexed in the ascending order is in plural and maximum coderates of the plurality of PUCCH resources are the same.

In the present specification, the determining of the PUCCH resourcecomprises determining the PUCCH resources based on the maximum coderate, when the PUCCH resource with the lowest index among the PUCCHresources corresponding to the number of REs having the value equal toor greater than the size of the payload for the multiple UCI among thevalues obtained by multiplying the configured maximum code rate and themodulation order by the number of REs corresponding to the PUCCHresources indexed in the ascending order is in plural and PUCCH formatsof the plurality of PUCCH resources are the same.

In the present specification, the PUCCH resources for transmitting themultiple UCI are resources for reporting channel state information(CSI).

In the present specification, a user equipment (UE) for transmittingmultiple uplink control information (UCI) on a physical uplink controlchannel (PUCCH) in a wireless communication system, the UE comprising aradio frequency (RF) module configured to transmit and receive a radiosignal; and a processor functionally connected to the RF module, whereinthe processor is configured to receive, from a base station, controlinformation related to a PUCCH resource for transmitting the multipleUCI, wherein the control information includes information related to anumber of REs of the PUCCH resource, information related to a modulationorder, and information related to a configured maximum code rate,determine a PUCCH resource for transmitting the multiple UCI bycomparing a value obtained by multiplying the configured maximum coderate and the modulation order by the number of REs corresponding to thePUCCH resources indexed in ascending order with a size of a payload forthe multiple UCI, and transmit, to the base station, the multiple UCI onthe determined PUCCH resource.

In the present specification, the processor is configured to determine,as the PUCCH resource for transmitting the multiple UCI, a PUCCHresource with a lowest index among PUCCH resources corresponding to thenumber of REs having a value equal to or greater than the size of thepayload for the multiple UCI among values obtained by multiplying theconfigured maximum code rate and the modulation order by the number ofREs corresponding to the PUCCH resources indexed in the ascending order.

In the present specification, the control information further includes aPUCCH format of the PUCCH resources, and the maximum code rate isdetermined by the PUCCH format.

In the present specification, the processor is configured to determinethe PUCCH resource based on the maximum code rate or the PUCCH format,when the PUCCH resource with the lowest index among the PUCCH resourcescorresponding to the number of REs having the value equal to or greaterthan the size of the payload for the multiple UCI among the valuesobtained by multiplying the configured maximum code rate and themodulation order by the number of REs corresponding to the PUCCHresources indexed in the ascending order is in plural.

In the present specification, a method for receiving, by a base station,multiple uplink control information (UCI) on a physical uplink controlchannel (PUCCH) in a wireless communication system, the methodcomprising transmitting, to a user equipment (UE), control informationrelated to a PUCCH resource for transmitting the multiple UCI, whereinthe control information includes information related to a number of REsof the PUCCH resource, information related to a modulation order, andinformation related to a configured maximum code rate; and receiving,from the UE, the multiple UCI on a determined PUCCH resource, whereinthe determined PUCCH resource is a PUCCH resource determined bycomparing a value obtained by multiplying the configured maximum coderate and the modulation order by the number of REs corresponding to thePUCCH resources indexed in ascending order with a size of a payload forthe multiple UCI.

BRIEF DESCRIPTION OF THE DRAWINGS

The accompanying drawings, that are included to provide a furtherunderstanding of the invention and are incorporated in and constitute apart of this specification, illustrate embodiments of the invention andtogether with the description serve to explain various principles of theinvention.

FIG. 1 illustrates an example of an overall structure of a NR system towhich a method proposed by the present specification is applicable.

FIG. 2 illustrates a relation between an uplink frame and a downlinkframe in a wireless communication system to which a method proposed bythe present specification is applicable.

FIG. 3 illustrates an example of a resource grid supported in a wirelesscommunication system to which a method proposed by the presentspecification is applicable.

FIG. 4 illustrates examples of a resource grid per antenna port andnumerology to which a method proposed by the present specification isapplicable.

FIG. 5 illustrates an example of a self-contained slot structure towhich a method proposed by the present specification is applicable.

FIG. 6 illustrates an example of component carriers and carrieraggregation in a wireless communication system to which the presentinvention is applicable.

FIG. 7 illustrates examples of deployment scenarios considering carrieraggregation in an NR system.

FIG. 8 is a flowchart illustrating an operation method of a UEperforming a method proposed by the present specification.

FIG. 9 is a flowchart illustrating an operation method of a base stationperforming a method proposed by the present specification.

FIG. 10 illustrates an example of a block configuration diagram of awireless communication device to which methods proposed by the presentspecification are applicable.

FIG. 11 illustrates another example of a block configuration diagram ofa wireless communication device to which methods proposed by the presentspecification are applicable.

DETAILED DESCRIPTION OF THE EMBODIMENTS

Reference will now be made in detail to embodiments of the invention,examples of which are illustrated in the accompanying drawings. Adetailed description to be disclosed below together with theaccompanying drawing is to describe exemplary embodiments of the presentinvention and not to describe a unique embodiment for carrying out thepresent invention. The detailed description below includes details toprovide a complete understanding of the present invention. However,those skilled in the art know that the present invention can be carriedout without the details.

In some cases, in order to prevent a concept of the present inventionfrom being ambiguous, known structures and devices may be omitted orillustrated in a block diagram format based on core functions of eachstructure and device.

In the present disclosure, a base station (BS) means a terminal node ofa network directly performing communication with a terminal. In thepresent disclosure, specific operations described to be performed by thebase station may be performed by an upper node of the base station, ifnecessary or desired. That is, it is obvious that in the networkconsisting of multiple network nodes including the base station, variousoperations performed for communication with the terminal can beperformed by the base station or network nodes other than the basestation. The ‘base station (BS)’ may be replaced with terms such as afixed station, Node B, evolved-NodeB (eNB), a base transceiver system(BTS), an access point (AP), gNB (general NB), and the like. Further, a‘terminal’ may be fixed or movable and may be replaced with terms suchas user equipment (UE), a mobile station (MS), a user terminal (UT), amobile subscriber station (MSS), a subscriber station (SS), an advancedmobile station (AMS), a wireless terminal (WT), a machine-typecommunication (MTC) device, a machine-to-machine (M2M) device, adevice-to-device (D2D) device, and the like.

In the present disclosure, downlink (DL) means communication from thebase station to the terminal, and uplink (UL) means communication fromthe terminal to the base station. In the downlink, a transmitter may bea part of the base station, and a receiver may be a part of theterminal. In the uplink, the transmitter may be a part of the terminal,and the receiver may be a part of the base station.

Specific terms used in the following description are provided to helpthe understanding of the present invention, and may be changed to otherforms within the scope without departing from the technical spirit ofthe present invention.

The following technology may be used in various wireless access systems,such as code division multiple access (CDMA), frequency divisionmultiple access (FDMA), time division multiple access (TDMA), orthogonalfrequency division multiple access (OFDMA), single carrier-FDMA(SC-FDMA), non-orthogonal multiple access (NOMA), and the like. The CDMAmay be implemented by radio technology such as universal terrestrialradio access (UTRA) or CDMA2000. The TDMA may be implemented by radiotechnology such as global system for mobile communications (GSM)/generalpacket radio service (GPRS)/enhanced data rates for GSM evolution(EDGE). The OFDMA may be implemented as radio technology such as IEEE802.11(Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802-20, E-UTRA (evolved UTRA),and the like. The UTRA is a part of a universal mobile telecommunicationsystem (UMTS). 3rd generation partnership project (3GPP) long termevolution (LTE), as a part of an evolved UMTS (E-UMTS) using E-UTRA,adopts the OFDMA in the downlink and the SC-FDMA in the uplink. LTE-A(advanced) is the evolution of 3GPP LTE.

Further, 5G new radio (NR) defines enhanced mobile broadband (eMBB),massive machine type communications (mMTC), ultra-reliable and lowlatency communications (URLLC), and vehicle-to-everything (V2X) based onusage scenario.

A 5G NR standard is divided into standalone (SA) and non-standalone(NSA) depending on co-existence between a NR system and a LTE system.

The 5G NR supports various subcarrier spacings and supports CP-OFDM inthe downlink and CP-OFDM and DFT-s-OFDM (SC-OFDM) in the uplink.

Embodiments of the present invention can be supported by standarddocuments disclosed in at least one of IEEE 802, 3GPP, and 3GPP2 whichare the wireless access systems. That is, steps or parts in embodimentsof the present invention which are not described to clearly show thetechnical spirit of the present invention can be supported by thestandard documents. Further, all terms described in the presentdisclosure can be described by the standard document.

3GPP LTE/LTE-A/New RAT (NR) is primarily described for cleardescription, but technical features of the present invention are notlimited thereto.

In the present specification, ‘A and/or B’ may be interpreted in thesame sense as ‘including at least one of A or B’.

Definition of Terms

eLTE eNB: The eLTE eNB is the evolution of eNB that supportsconnectivity to EPC and NGC.

gNB: A node which supports the NR as well as connectivity to NGC.

New RAN: A radio access network which supports either NR or E-UTRA orinterfaces with the NGC.

Network slice: A network slice is a network created by the operatorcustomized to provide an optimized solution for a specific marketscenario which demands specific requirements with end-to-end scope.

Network function: A network function is a logical node within a networkinfrastructure that has well-defined external interfaces andwell-defined functional behaviour.

NG-C: A control plane interface used on NG2 reference points between newRAN and NGC.

NG-U: A user plane interface used on NG3 references points between newRAN and NGC.

Non-standalone NR: A deployment configuration where the gNB requires anLTE eNB as an anchor for control plane connectivity to EPC, or requiresan eLTE eNB as an anchor for control plane connectivity to NGC.

Non-standalone E-UTRA: A deployment configuration where the eLTE eNBrequires a gNB as an anchor for control plane connectivity to NGC.

User plane gateway: A termination point of NG-U interface.

Numerology: The numerology corresponds to one subcarrier spacing in afrequency domain. By scaling a reference subcarrier spacing by aninteger N, different numerologies can be defined.

NR: NR radio access or new radio.

General System

FIG. 1 illustrates an example of an overall structure of a NR system towhich a method proposed by the present specification is applicable.

Referring to FIG. 1, an NG-RAN is composed of gNBs that provide an NG-RAuser plane (new AS sublayer/PDCP/RLC/MAC/PHY) and a control plane (RRC)protocol terminal for a UE (User Equipment).

The gNBs are connected to each other via an Xn interface.

The gNBs are also connected to an NGC via an NG interface.

More specifically, the gNBs are connected to an access and mobilitymanagement function (AMF) via an N2 interface and a User Plane Function(UPF) via an N3 interface.

NR (New Rat) Numerology and Frame Structure

In the NR system, multiple numerologies may be supported. Thenumerologies may be defined by subcarrier spacing and a CP (CyclicPrefix) overhead. Spacing between the plurality of subcarriers may bederived by scaling basic subcarrier spacing into an integer N (or μ). Inaddition, although a very low subcarrier spacing is assumed not to beused at a very high subcarrier frequency, a numerology to be used may beselected independent of a frequency band.

In addition, in the NR system, a variety of frame structures accordingto the multiple numerologies may be supported.

Hereinafter, an orthogonal frequency division multiplexing (OFDM)numerology and a frame structure, which may be considered in the NRsystem, will be described.

A plurality of OFDM numerologies supported in the NR system may bedefined as in Table 1.

TABLE 1 μ Δƒ = 2^(μ) · 15 [kHz] Cyclic prefix 0 15 Normal 1 30 Normal 260 Normal, Extended 3 120 Normal 4 240 Normal 5 480 Normal

Regarding a frame structure in the NR system, a size of various fieldsin the time domain is expressed as a multiple of a time unit ofT_(S)1/(Δƒ_(max)·N_(f)). In this case, Δƒ_(max)=480·10³ and N_(f)=4096.DL and UL transmission is configured as a radio frame having a sectionof T_(f)=(Δƒ_(max)N_(f)/100)·T_(S)=1 ms. The radio frame is composed often set of UL frames and a set of DL frames.

FIG. 2 illustrates a relation between an uplink frame and a downlinkframe in a wireless communication system to which a method proposed bythe present specification is applicable.

As illustrated in FIG. 2, a UL frame number I from a User Equipment (UE)needs to be transmitted T_(TA)=N_(TA)T, before the start of acorresponding DL frame in the UE.

Regarding the numerology μ, slots are numbered in ascending order ofn_(S) ^(μ)∈{0, . . . , N_(subframe) ^(slots,μ)−1} in a subframe, and inascending order of n_(s,f) ^(μ)∈{0, . . . , N_(frame) ^(slots,μ)−1} in aradio frame. One slot is composed of continuous OFDM symbols of N_(symb)^(μ), and N_(symb) ^(μ) is determined depending on a numerology in useand slot configuration. The start of slots n_(s) ^(μ) in a subframe istemporally aligned with the start of OFDM symbols n_(s) ^(μ)N_(symb)^(μ) in the same subframe.

Not all UEs are able to transmit and receive at the same time, and thismeans that not all OFDM symbols in a DL slot or an UL slot are availableto be used.

Table 2 shows the number of OFDM symbols per slot for a normal CP in thenumerology μ, and Table 3 shows the number of OFDM symbols per slot foran extended CP in the numerology μ.

TABLE 2 Slot configuration 0 1 μ N_(symb) ^(μ) N_(frame) ^(slots,μ)N_(subframe) ^(slots,μ) N_(symb) ^(μ) N_(frame) ^(slots,μ) N_(subframe)^(slots,μ) 0 14 10 1 7 20 2 1 14 20 2 7 40 4 2 14 40 4 7 80 8 3 14 80 8— — — 4 14 160 16 — — — 5 14 320 32 — — —

TABLE 3 Slot configuration 0 1 μ N_(symb) ^(μ) N_(frame) ^(slots,μ)N_(subframe) ^(slots,μ) N_(symb) ^(μ) N_(frame) ^(slots,μ) N_(subframe)^(slots,μ) 0 12 10 1 6 20 2 1 12 20 2 6 40 4 2 12 40 4 6 80 8 3 12 80 8— — — 4 12 160 16 — — — 5 12 320 32 — — —

NR Physical Resource

Regarding physical resources in the NR system, an antenna port, aresource grid, a resource element, a resource block, a carrier part,etc. may be considered.

Hereinafter, the above physical resources possible to be considered inthe NR system will be described in more detail.

First, regarding an antenna port, the antenna port is defined such thata channel over which a symbol on one antenna port is transmitted can beinferred from another channel over which a symbol on the same antennaport is transmitted. When large-scale properties of a channel receivedover which a symbol on one antenna port can be inferred from anotherchannel over which a symbol on another antenna port is transmitted, thetwo antenna ports may be in a QC/QCL (quasi co-located or quasico-location) relationship. Herein, the large-scale properties mayinclude at least one of Delay spread, Doppler spread, Frequency shift,Average received power, and Received Timing.

FIG. 3 illustrates an example of a resource grid supported in a wirelesscommunication system to which a method proposed by the presentspecification is applicable.

Referring to FIG. 3, a resource grid is composed of N_(RB) ^(μ)N_(SC)^(RB) subcarriers in a frequency domain, each subframe composed of 14·2μOFDM symbols, but the present disclosure is not limited thereto.

In the NR system, a transmitted signal is described by one or moreresource grids, composed of N_(RB) ^(μ)N_(SC) ^(RB) subcarriers, and2^(μ)N_(symb) ^((μ)) OFDM symbols Herein, N_(RB) ^(μ)≤N_(RB) ^(max,μ).The above N_(RB) ^(max,μ) indicates the maximum transmission bandwidth,and it may change not just between numerologies, but between UL and DL.

In this case, as illustrated in FIG. 4, one resource grid may beconfigured per the numerology μ and an antenna port p.

FIG. 4 illustrates examples of a resource grid per antenna port andnumerology to which a method proposed by the present specification isapplicable.

Each element of the resource grid for the numerology μ and the antennaport p is indicated as a resource element, and may be uniquelyidentified by an index pair (k, l). Herein, k=0, . . . ,N_(RB)^(μ)N_(SC) ^(RB) −1 is an index in the frequency domain, and l=0, . . .,2^(μ)N_(symb) ^((μ))−1 indicates a location of a symbol in a subframe.To indicate a resource element in a slot, the index pair (k,l) is used,where l=0, . . . ,N_(symb) ^(μ)−1

The resource element (k,l) for the numerology μ and the antenna port pcorresponds to a complex value α_(k,l) ^((p,μ)). When there is no riskof confusion or when a specific antenna port or numerology is specified,the indexes p and μ may be dropped and thereby the complex value maybecome a_(k,l) ^((p)) or a_(k,l.)

In addition, a physical resource block is defined as N_(SC) ^(RB)=12 sccontinuous subcarriers in the frequency domain. In the frequency domain,physical resource blocks may be numbered from 0 to N_(RB) ^(μ)−1. Atthis point, a relationship between the physical resource block numbern_(PRB) and the resource elements (k,l) may be given as in Equation 1.

$\begin{matrix}{n_{PRB} = \left\lfloor \frac{k}{N_{sc}^{RB}} \right\rfloor} & \left\lbrack {{Equation}\mspace{14mu} 1} \right\rbrack\end{matrix}$

In addition, regarding a carrier part, a UE may be configured to receiveor transmit the carrier part using only a subset of a resource grid. Atthis point, a set of resource blocks which the UE is configured toreceive or transmit are numbered from 0 to N_(URB) ^(μ)−1 in thefrequency region.

Self-Contained Slot Structure

To minimize latency of data transmission in a TDD system, 5G new RAT(NR) has considered a self-contained slot structure illustrated in FIG.5.

That is, FIG. 5 illustrates an example of a self-contained slotstructure to which a method proposed by the present specification isapplicable.

In FIG. 5, a hatched portion 510 denotes a downlink control region, anda black portion 520 denotes an uplink control region.

A non-marked portion 530 may be used for downlink data transmission oruplink data transmission.

Such a structure may be characterized in that DL transmission and ULtransmission are sequentially performed in one slot, DL data is sent inone slot, and UL Ack/Nack is also transmitted and received in one slot.

Such a slot may be defined as a ‘self-contained slot’.

That is, through the slot structure, the base station reduces the timeit takes to retransmit data to the UE when a data transmission erroroccurs, and thus can minimize latency of final data delivery.

In the self-contained slot structure, the base station and the UErequire a time gap in a process for switching from a transmission modeto a reception mode or a process for switching from the reception modeto the transmission mode.

To this end, in the corresponding slot structure, some OFDM symbols attime of switching from DL to UL are configured as a guard period (GP).

Carrier Aggregation

In embodiments of the present invention, a communication environment tobe considered includes all multi-carrier supporting environments. Thatis, a multi-carrier system or a carrier aggregation (CA) system used inthe present invention refers to a system that aggregates and uses one ormore component carriers (CCs) with a bandwidth less than a target bandwhen configuring a target wideband, in order to support a wideband.

In the present invention, multi-carrier means aggregation of carriers(or carrier aggregation). In this instance, the aggregation of carriersmeans both aggregation between continuous carriers and aggregationbetween non-contiguous carriers. Further, the number of componentcarriers aggregated between downlink and uplink may be differently set.A case where the number of downlink component carriers (hereinafterreferred to as “DL CC”) and the number of uplink component carriers(hereinafter, referred to as “UL CC”) are the same is referred to as“symmetric aggregation”, and a case where the number of downlinkcomponent carriers and the number of uplink component carriers aredifferent is referred to as “asymmetric aggregation”. The carrieraggregation may be used interchangeably with a term such as bandwidthaggregation or spectrum aggregation.

Carrier aggregation configured by combining two or more componentcarriers aims at supporting up to a bandwidth of 100 MHz in the LTE-Asystem. When one or more carriers with a bandwidth smaller than a targetband are combined, a bandwidth of the combined carriers may be limitedto a bandwidth used in an existing system in order to maintain backwardcompatibility with the existing IMT system. For example, the existing3GPP LTE system supports bandwidths of {1.4, 3, 5, 10, 15, 20} MHz, anda 3GPP LTE-advanced (i.e., LTE-A) system may be configured to support abandwidth greater than 20 MHz by using only the bandwidths forcompatibility with the existing system. Further, the carrier aggregationsystem used in the preset invention may be configured to support thecarrier aggregation by defining a new bandwidth regardless of thebandwidth used in the existing system.

The LTE-A system uses a concept of a cell to manage a radio resource.

An environment of the carrier aggregation may be called a multi-cellenvironment. The cell is defined as a combination of a pair of adownlink resource (DL CC) and an uplink resource (UL CC), but the uplinkresource is not essential. Therefore, the cell may consist of only thedownlink resource or both the downlink resource and the uplink resource.When a specific UE has only one configured serving cell, the cell mayhave one DL CC and one UL CC. However, when the specific UE has two ormore configured serving cells, the cells have DL CCs as many as thecells and the number of UL CCs may be equal to or less than the numberof DL CCs.

Alternatively, on the contrary, the DL CC and the UL CC may beconfigured. That is, when the specific UE has multiple configuredserving cells, a carrier aggregation environment, in which the number ofUL CCs is more than the number of DL CCs, may also be supported. Thatis, the carrier aggregation may be understood as aggregation of two ormore cells each having a different carrier frequency (center frequency).The ‘cell’ described here needs to be distinguished from a ‘cell’ as aregion which is generally used and is covered by the base station.

The cell used in the LTE-A system includes a primary cell (PCell) and asecondary cell (SCell). The PCell and the SCell may be used as a servingcell. In case of the UE which is in an RRC_CONNECTED state, but does nothave the configured carrier aggregation or does not support the carrieraggregation, only one serving cell consisting of only the PCell ispresent. On the other hand, in case of the UE which is in theRRC_CONNECTED state and has the configured carrier aggregation, one ormore serving cells may be present and the PCell and one or more SCellsare included in all serving cells.

The serving cell (PCell and SCell) may be configured through an RRCparameter. PhysCellld as a physical layer identifier of the cell hasinteger values of 0 to 503. SCelllndex as a short identifier used toidentify the SCell has integer values of 1 to 7. ServCelllndex as ashort identifier used to identify the serving cell (PCell and SCell) hasthe integer values of 0 to 7. The value of 0 is applied to the PCell,and SCelllndex is previously given for application to the SCell. Thatis, a cell having a smallest cell ID (or cell index) in ServCellIndex isthe PCell.

The PCell means a cell that operates on a primary frequency (or primaryCC). The PCell may be used for the UE to perform an initial connectionestablishment process or a connection re-establishment process and maybe designated as a cell indicated in a handover process. Further, thePCell means a cell which is the center of control-related communicationamong serving cells configured in the carrier aggregation environment.That is, the UE may be allocated and transmit a PUCCH only in a PCell ofthe corresponding UE and use only the PCell to acquire systeminformation or change a monitoring procedure. An evolved universalterrestrial radio access (E-UTRAN) may change only the PCell for thehandover procedure to the UE supporting the carrier aggregationenvironment by using an RRC connection reconfiguration messageRRCConnectionReconfigutaion of higher layer including mobile controlinformation mobilityControlInfo.

The SCell may mean a cell that operates on a secondary frequency (orsecondary CC). Only one PCell may be allocated to a specific UE, and oneor more SCells may be allocated to the specific UE. The SCell may beconfigured after RRC connection establishment is achieved and used toprovide an additional radio resource. The PUCCH is not present inresidual cells, i.e., the SCells other than the PCell among the servingcells configured in the carrier aggregation environment. The E-UTRAN mayprovide all system information related to an operation of a relatedcell, which is in an RRC_CONNECTED state, through a dedicated signalwhen adding the SCells to the UE that supports the carrier aggregationenvironment. A change of the system information may be controlled byreleasing and adding the related SCell, and in this case, the RRCconnection reconfiguration message “RRCConnectionReconfigutaion” ofhigher layer may be used. The E-UTRAN may perform dedicated signalinghaving a different parameter for each UE rather than broadcasting in therelated SCell.

After an initial security activation process starts, the E-UTRAN can addthe SCells to the initially configured PCell in the connectionestablishment process to configure a network including one or moreSCells. In the carrier aggregation environment, the PCell and the SCellmay operate as the respective component carriers. In embodimentsdescribed below, a primary component carrier (PCC) may be used as thesame meaning as the PCell, and a secondary component carrier (SCC) maybe used as the same meaning as the SCell.

FIG. 6 illustrates an example of component carriers and carrieraggregation in a wireless communication system to which the presentinvention is applicable.

FIG. 6(a) illustrates a single carrier structure used in the LTE system.A component carrier includes a DL CC and an UL CC. One component carriermay have a frequency range of 20 MHz.

FIG. 6(b) illustrates a carrier aggregation structure used in the LTE-Asystem. More specifically, FIG. 6(b) illustrates that three componentcarriers having a frequency magnitude of 20 MHz are combined. Three DLCCs and three UL CCs are provided, but the number of DL CCs and thenumber of UL CCs are not limited. In the case of carrier aggregation,the UE may simultaneously monitor three CCs, receive downlinksignal/data, and transmit uplink signal/data.

If N DL CCs are managed in a specific cell, the network may allocate M(M≤N) DL CCs to the UE. In this instance, the UE may monitor only Mlimited DL CCs and receive the DL signal. Further, the network mayprioritize L (L≤M≤N) DL CCs and allocate a primary DL CC to the UE. Inthis case, the UE has to monitor the L DL CCs. Such a scheme may beequally applied to uplink transmission.

A linkage between a carrier frequency (or DL CC) of a downlink resourceand a carrier frequency (or UL CC) of an uplink resource may beindicated by a higher layer message such as a RRC message or systeminformation. For example, a combination of the DL resource and the ULresource may be configured by a linkage defined by system informationblock type 2 (SIB2). More specifically, the linkage may mean a mappingrelation between the DL CC, on which a PDCCH carrying a UL grant istransmitted, and the UL CC using the UL grant, and mean a mappingrelation between the DL CC (or UL CC) on which data for HARQ istransmitted and the UL CC (or DL CC) on which HARQ ACK/NACK signal istransmitted.

If one or more SCells are configured to the UE, the network may activateor deactivate the configured SCell(s). The PCell is always activated.The network activates or deactivates the SCell(s) by sending anactivation/deactivation MAC control element.

The activation/deactivation MAC control element has a fixed size andconsists of a single octet including seven C-fields and one R-field. TheC-field is configured for each SCell index (SCelllndex), and indicatesthe activation/deactivation state of the SCell. When a value of theC-field is set to ‘1’, it indicates that a SCell having a correspondingSCell index is activated. When a value of the C-field is set to ‘0’, itindicates that a SCell having a corresponding SCell index isdeactivated.

Further, the UE maintains a timer sCellDeactivationTimer per configuredSCell and deactivates the associated SCell when the timer expires. Thesame initial timer value is applied to each instance of the timersCellDeactivationTimer and is configured by RRC signaling. When theSCell(s) are added or after handover, initial SCell(s) are in adeactivation state.

The UE performs the following operation on each of the configuredSCell(s) in each TTI.

-   -   If the UE receives an activation/deactivation MAC control        element that activates the

SCell in a specific TTI (subframe n), the UE activates the SCell in aTTI (subframe n+8 or thereafter) corresponding to fixed timing and(re)starts a timer related to the corresponding SCell. What the UEactivates the SCell means that the UE applies a normal SCell operation,such as sounding reference signal (SRS) transmission on the SCell,channel quality indicator (CQI)/precoding matrix indicator (PMI)/rankindication (RI)/precoding type indicator (PTI) reporting for the SCell,PDCCH monitoring on the SCell, and PDCCH monitoring for the SCell.

-   -   If the UE receives an activation/deactivation MAC control        element that deactivates the SCell in a specific TTI        (subframe n) or if a timer related to a specific TTI (subframe        n)-activated SCell expires, the UE deactivates the SCell in a        TTI (subframe n+8 or thereafter) corresponding to fixed timing,        stops the timer of the corresponding SCell, and flushes all of        HARQ buffers related to the corresponding SCell.    -   If a PDCCH on the activated SCell indicates an uplink grant or a        downlink assignment or if a PDCCH on a serving cell scheduling        the activated SCell indicates an uplink grant or a downlink        assignment for the activated SCell, the UE restarts a timer        related to the corresponding SCell.    -   If the SCell is deactivated, the UE does not transmit the SRS on        the SCell, does not report CQI/PMI/RI/PTI for the SCell, does        not transmit UL-SCH on the SCell, and does not monitor the PDCCH        on the SCell.

The above-described carrier aggregation has been described based on theLTE/LTE-A system, but it is for convenience of description and can beextended and applied to the 5G NR system in the same or similar manner.In particular, carrier aggregation deployment scenarios that may beconsidered in the 5G NR system may be the same as FIG. 7.

FIG. 7 illustrates examples of deployment scenarios considering carrieraggregation in an NR system.

Referring to FIGS. 7, F1 and F2 may respectively mean a cell configuredto a first frequency (or a first frequency band, a first carrierfrequency, a first center frequency) and a cell configured as a secondfrequency (or a second frequency band, a second carrier frequency or asecond center frequency).

FIG. 7(a) illustrates a first CA deployment scenario. As illustrated inFIG. 7(a), the F1 cell and the F2 cell may be co-located and overlaid.In this case, both the two layers can provide sufficient coverage, andmobility can be supported on the two layers. The first CA deploymentscenario may include a case where the F1 cell and the F2 cell arepresent in the same band. In the first CA deployment scenario, it isexpected that aggregation is possible between the overlaid F1 and F2cells.

FIG. 7(b) illustrates a second CA deployment scenario. As illustrated inFIG. 7(b), the F1 cell and the F2 cell may be co-located and overlaid,but the F2 cell may support smaller coverage due to a larger path loss.In this case, only the F1 cell provides sufficient coverage, and the F2cell may be used to improve throughput. In this instance, mobility maybe performed based on the coverage of the F1 cell. The second CAdeployment scenario may include a case where the F1 cell and the F2 cellare present in different bands (e.g., the F1 cell is present in {800MHz, 2 GHz} and the F2 cell is present in {3.5 GHz}). In the second CAdeployment scenario, it is expected that aggregation is possible betweenthe overlaid F1 and F2 cells.

FIG. 7(c) illustrates a third CA deployment scenario. As illustrated inFIG. 7(c), the Fl cell and the F2 cell are co-located and overlaid, butantennas of the F2 cell may be directed to boundaries of the F1 cell sothat cell edge throughput is increased. In this case, the F1 cellprovides sufficient coverage, but the F2 cell may potentially have holesdue to a larger path loss. In this instance, mobility may be performedbased on the coverage of the F1 cell. The third CA deployment scenariomay include a case where the Fl cell and the F2 cell are present indifferent bands (e.g., the F1 cell is present in {800 MHz, 2 GHz} andthe F2 cell is present in {3.5 GHz}). In the third CA deploymentscenario, it is expected that the F 1 and F2 cells of the same basestation (e.g., eNB) can be aggregated in a region where coverageoverlaps.

FIG. 7(d) illustrates a fourth CA deployment scenario. As illustrated inFIG. 7(d), the F1 cell provides macro coverage, and F2 remote radioheads (RRHs) may be used to improve throughput at hot spots. In thisinstance, mobility may be performed based on the coverage of the F1cell. The fourth CA deployment scenario may include both a case wherethe F1 cell and the F2 cell correspond to DL non-contiguous carriers onthe same band (e.g., 1.7 GHz) and a case where the F1 cell and the F2cell are present on different bands (e.g., the F1 cell is present in{800 MHz, 2 GHz} and the F2 cell is present in {3.5 GHz}). In the fourthCA deployment scenario, it is expected that the F2 cells (i.e., RRHs)can be aggregated with the F1 cell(s) (i.e., macro cell(s)) underlyingthe F2 cells.

FIG. 7(e) illustrates a fifth CA deployment scenario. The fifth CAdeployment scenario is similar to the second CA deployment scenario, butfrequency selective repeaters may be deployed so that coverage can beextended for one of the carrier frequencies. In the fifth CA deploymentscenario, it is expected that the F1 and F2 cells of the same basestation can be aggregated in a region where coverage overlaps.

A reception timing difference at the physical layer of UL grants and DLassignments for the same TTI (e.g., depending on the number of controlsymbols, propagation and deployment scenario) although it is caused bydifferent serving cells may not affect a MAC operation. The UE may needto cope with a relative propagation delay difference of up to 30 usamong the CCs to be aggregated in both intra-band non-contiguous CA andinter-band non-contiguous CS. This may mean that the UE needs to copewith a delay spread of up to 30.26 us among the CCs monitored at areceiver because a time alignment of the base station is specified to beup to 0.26 us. This may also mean that the UE have to cope with amaximum uplink transmission timing difference between TAGs of 36.37 usfor inter-band CA with multiple TAGs.

When the CA is deployed, frame timing and a system frame number (SFN)may be aligned across aggregated cells.

The NR system can support a physical uplink control channel (PUCCH) thatis a physical channel for transmitting uplink control information (UCI)including information, such as hybrid automatic repeatrequest-acknowledgement (HARQ-ACK), scheduling request (SR), channelstate information (CSI), etc.

In this instance, the PUCCH may be divided into a small-payload PUCCHsupporting small UCI payload (e.g., 1˜2-bit UCI) and a large-payloadPUCCH supporting large UCI payload (e.g., more than 2 bits and up tohundreds of bits) depending on UCI payload.

In addition, each of the small-payload PUCCH and the large-payload PUCCHmay be subdivided into a short PUCCH with a short duration (e.g.,1˜2-symbol duration) and a long PUCCH with a long duration (e.g.,4˜14-symbol duration).

In embodiments, the long PUCCH has to transmit mainly medium/large UCIpayload or may be used to improve coverage of the small UCI payload.

In addition, when it is required to additionally expand coveragecompared to the long PUCCH, a multi-slot long PUCCH in which the sameUCI is transmitted over multiple slots can be supported.

For example, if coverage cannot be secured in a given UCI payload and acode rate, the UE can secure the coverage through a gain resulting fromrepeated transmission using the multi-slot long PUCCH.

In this instance, the PUCCHs may be classified according to atransmittable UCI payload size, a PUCCH structure (e.g., PUCCH length insymbols, etc.), and a multiplexing capacity, and may also be defined andsupported as multiple PUCCH formats.

For example, the PUCCH formats may consist of a small-payload shortPUCCH, a small-payload long PUCCH, a large-payload short PUCCH, alarge-payload long PUCCH, a medium-payload long PUCCH, and the like.

The medium/large UCI payload transmitted on the long PUCCH may consistof one or multiple combinations among the above UCI (e.g., HARQ-ACK, SR,CSI, etc.).

The above case will be represented as ‘multiple UCI on long PUCCH’ forconvenience of explanation.

Further, examples of simultaneous transmission of multiple UCI on thelong PUCCH may include simultaneous transmission of HARQ-ACK (orHARQ-ACK and SR) and CSI.

In the following description, an operation supporting multiple UCI onlong PUCCH will be describe in detail.

UCI Partitioning for Supporting Multiple UCI on Long PUCCH

First, UCI partitioning for supporting multiple UCI transmission on longPUCCH is described.

If multiple UCI payloads include CSI report, the payload may be variableby the number of ranks decided by the UE.

In this case, in order to avoid blind detection (BD) at a base station(e.g., next generation Node B (gNB)), the UE may transmit directly orindirectly, to the gNB, information (e.g., rank information, etc.)capable of determining a UCI payload size.

In addition, the UE may divide total variable-size UCI into part 1 UCIthat is a fixed part and part 2 UCI that is a variable part andseparately encode it.

Further, after the UE causes rank information, etc. capable ofdetermining a size of the part 2 UCI to be included in fixed-size part 1UCI and encodes it, the UE may transmit it.

UCI to RE Mapping for Support of Multiple UCI on Long PUCCH

Next, UCI to RE mapping for supporting multiple UCI transmission on longPUCCH is described below.

This is for the case where CSI for PUCCH transmission of variable-sizeCSI report described above is configured to be partitioned into fixedsize part 1 CSI and variable-size part 2 CSI.

In this case, the gNB can grasp a payload size of the part 2 CSI onlywhen successfully decoding the part 1 CSI, and attempt the decodingbased on this.

Thus, it can be said that the part 1 CSI has priority over the part 2CSI in terms of decoding order and performance.

Accordingly, when multiple UCI payloads are configured to support themultiple UCI on long PUCCH, HARQ-ACK (or HARQ-ACK and SR) informationwith high importance together with the part 1 CSI may configure part 1UCI and may be jointly encoded, and part 2 UCI may consist of only thepart 2 CSI and may be separately encoded.

For reason of the performance priority or the like described above, REmapping of the part 1 UCI may be performed so that the part 1 UCI ispreferentially as close as possible to a

PUCCH demodulation reference signal (DMRS).

After the RE mapping of the part 1 UCI through the above method, REmapping of the part 2 UCI may be performed in a remaining PUCCH region.

The above-described RE mapping operation may be performed by the UE, andmay be performed by the gNB when UCI can be interpreted as downlinkcontrol information (DCI).

In this instance, a basic unit of the RE mapping operation is amodulation symbol.

Thus, in order to faithfully support a RE mapping method by separatingthe part 1 UCI and the part 2 UCI, part 1 and part 2 UCI coded bits haveto be separated on a per modulation symbol basis.

To this end, the part 1 UCI coded bits and/or the part 2 UCI coded bitsfor supporting the multiple UCI on long PUCCH may be partitioned to bedivided by a multiple of modulation order Qm.

As a method for generating the part 1 UCI coded bit so that the part 1UCI coded bit is the multiple of the Qm, the following method may beconsidered.

A maximum code rate Rmax which is allowed per PUCCH format may bepreviously configured to the UE via higher layer signaling, and the UEmay apply a code rate less than the maximum code rate Rmax upon actualUCI transmission.

In this instance, when a size N_p1/Rmax of the part 1 UCI coded bitscalculated considering part 1 UCI payload size Np_1 and Rmax is not themultiple of the Qm, i.e., when (N_p1/Rmax) mod Qm≠0, rate matching maybe performed so that the size N_p1/Rmax is the multiple of the Qm.

In embodiments, the rate matching means an output operation performed sothat a bit size of the part 1 UCI coded bit is the multiple of the Qmwhen a channel coding output buffer (e.g., circular buffer) outputs thepart 1 UCI coded bit.

In addition to the rate matching operation, a final output may be themultiple of the Qm by performing circular repetition in a part 1 UCIcoded bit sequence generated based on the N_p1/Rmax, or repeating a lastpart of the part 1 UCI coded bit sequence, or padding ‘0’, ‘1’, or arandom number.

Further, some (e.g., initial bit(s) of the part 2 UCI coded bits) of thepart 2 UCI coded bits may be used as padding bit(s).

In the same manner as the part 1 UCI coded bits, the part 2 UCI codedbits may be configured to be the multiple of the Qm through the samemethod.

The method described above may be performed by the following steps (1)to (4) which are performed by the UE.

(1) The total number of UCI coded bits that can be transmitted to PUCCHfrom configured PUCCH resource parameters may be calculated using thefollowing Equation 2.

[Equation 2]

N _(t) =N _(sym) ×N _(RB) ×N _(SC) ×Q _(m)

In Equation 2, is the number of transmittable PUCCH symbols ofconfigured UCI, N_(RB) is the number of configured PUCCH RBs, N_(SC) isthe number of subcarriers in 1 RB (e.g., N_(SC)=12), Q_(m) is modulationorder (e.g., 2 for QPSK).

(2) Part 1 UCI coded bit size N_c1 within range not exceeding from thePart 1 UCI payload and the Rmax may be determined using the followingEquation 3 (in this instance, N_cl is configured to be the multiple ofthe Qm).

[Equation 3]

N_c1=min(N_(t)[N_p1/R_(max)/Q_(m)]×Q_(m))

In Equation 3, is part 1 UCI payload size, R_(max) is a configuredmaximum code rate, and means a ceiling operation.

(3) Part 2 UCI coded bit size N_c2 may be determined using the followingEquation 4.

[Equation 4]

N_c2=N_(t)−N_c1

(4) The UE individually generates the part 1 UCI coded bits and the part2 UCI coded bits in conformity with N_c1 and N_c2 using the method (ratemating, padding, etc.) for generating the part 1 UCI coded bit so thatthe part 1 UCI coded bit is the multiple of the Q_(m), and then performsthe RE mapping via modulation (e.g., QPSK modulation).

Method for determining resources for support of multiple UCI on longPUCCH

Next, a method for determining resources for supporting multiple UCItransmission on long PUCCH is described below.

For a method for determining resources when simultaneously transmittingmultiple

UCI (e.g., HARQ-ACK (or HARQ-ACK and SR) and CSI), the following twocases (Case 1 and Case 2) may be considered.

For the two cases to be described below, a maximum code rate Rmax whichis allowed per PUCCH format may be previously configured to the UE viahigher layer signaling, and the UE may apply a code rate R less than theRmax upon actual UCI transmission.

(Case 1)

Case 1 is a case where multiple UCI is transmitted on large-payload longPUCCH configured for HARQ-ACK (i.e., a case where HARQ-ACK resource isindicated via downlink control information (DCI)).

In the Case 1, after multiple PUCCH resource sets are previouslyconfigured to the UE via the higher layer signaling, the UE may selectone of the multiple PUCCH resource sets depending on total UCI payloadsize N_p.

The selected PUCCH resource set may include again multiple PUCCHresources.

In the Case 1, the PUCCH resource(s) in the PUCCH resource set may beindicated by a HARQ-ACK resource indicator in a DCI field for schedulinga PDSCH corresponding to HARQ-ACK bit.

When there are a large number of PUCCH resources in the PUCCH resourceset, the gNB may indicate, to the UE, the PUCCH resources in the PUCCHresource set through an implicit indication method or a combination ofDCI and implicit indication in order to reduce a DCI overhead.

For example, the implicit indication method may be a method fordetermining the PUCCH resources based on a control channel element (CCE)index of PDSCH scheduling DCI.

The number of RBs that are used for the UE to transmit the multiple UCIon long PUCCH may be determined by the total UCI payload size Np and themaximum code rate Rmax.

The value thus determined may be different from the number of RBsallocated through the PUCCH resource.

(Case 2)

Case 2 is a case where multiple UCI is transmitted on large-payload longPUCCH configured for CSI report (i.e., a case where HARQ-ACK resourcecannot be indicated via DCI).

In the Case 2, after multiple PUCCH resources for the CSI report arepreviously configured to the UE via the higher layer signaling, the UEmay select one of the multiple PUCCH resources by a combination of thetotal UCI payload size N_p and the maximum code rate Rmax.

For example, it is assumed that the number of REs on which PUCCHtransmission allocated at PUCCH resource i is possible is N_(RE,i).

[Equation 5]

N_(Rej)≥N_p/Rmax/Qm

In this case, the UE may select a PUCCH resource corresponding to aminimum value N_(REI,min) among N_(REI) value(s) satisfying the aboveEquation 5.

To more easily know a relation between Np and other parameters, theabove Equation 5 may be modified to the following Equation 6.

[Equation 6]

N_p≤N_(REI)×R_(maxx)×Q_(m)

That is, in order to transmit all DCI on PUCCH resource, the UE maydetermine a PUCCH with a lowest index (or a minimum index) among PUCCHresources corresponding to the number of REs having a value equal to orgreater than a size of a payload for all the UCI among values obtainedby multiplying the maximum code rate Rmax and the modulation order Qm bythe number of REs corresponding to the PUCCH resource, and transmit allthe UCI on the determined PUCCH.

Here, the maximum code rate may be a configured value as described belowor a previously defined value.

If the maximum code rate is the configured value, the configured maximumcode rate may mean an index. In this case, the index may be mapped to avalue of an actually applied maximum code rate.

In this instance, in the same manner as the Case 1, the number of RBsthat are used for the UE to actually transmit UCI may be determined byN_p and Rmax, and the value thus determined may be different from thenumber of RBs allocated through the PUCCH resource.

If the Part 2 CSI is variable-size, the UE may determine the PUCCHresource or the PUCCH resource set based on N_p as in the above methodand may not inform explicitly or implicitly the gNB of N_p information.

In this case, the gNB may have to reserve excessive PUCCH resourcestaking account of the variable-size of the Part 2 CSI, or performexcessive BD for PUCCH resource and/or PUCCH resource set for severalN_p possibilities.

This has a problem that the whole resource overhead and computationalcomplexity and decoding time at the gNB are increased.

First, in the Case 1, due to uncertainty of N_p, the gNB assumesmultiple PUCCH resource sets and has to attempt the decoding using aHARQ-ACK resource indicator of DCI.

In this instance, even if the gNB uses the HARQ-ACK resource indicatorvia the DCI, the gNB assumes several RB sizes and has to attemptfixed-size part 1 UCI decoding since the N_p is still uncertain from thegNB perspective.

Assuming that there is a large difference between the number of RBsallocated at PUCCH resource and the number of RBs used for the actualUCI transmission, the number of times of BD at the gNB may excessivelyincrease.

In the Case 2, due to uncertainty of Np, the gNB assumes several Npvalues for the multiple PUCCH resources configured via the higher layersignaling and has to perform the BD for the fixed-size part 1 UCIdecoding.

The following methods are considered to solve or mitigate theabove-mentioned problem.

(Method 1)

This is a method for the case where multiple UCI is transmitted onlarge-payload long PUCCH configured for HARQ-ACK (i.e., a case whereHARQ-ACK resource is indicated via DCI).

A. Method for Determining PUCCH Resource Set

(Method 1-A-1) is a method for determining, by the UE, a PUCCH resourceset based on fixed-size part 1 UCI (or part 1 CSI), or fixed-size part 1UCI (or part 1 CSI) and Rmax.

(Method 1-A-2) is a method for determining, by the UE, a PUCCH resourceset based on fixed-size part 1 UCI (or part 1 CSI) and fixed-size‘reference’ part 2 UCI (or ‘reference’ part 2 CSI), or fixed-size part 1UCI (or part 1 CSI), fixed-size ‘reference’ part 2 UCI (or ‘reference’part 2 CSI), and Rmax.

The reference part 2 UCI (or reference part 2 CSI) refers to a valuethat can be configured in a range of a minimum value (e.g., 0) and amaximum value the part 2 UCI (or part 2 CSI) can have in considerationof variable-size part 2 UCI (or part 2 CSI).

That is, the reference part 2 UCI (or reference part 2 CSI) is areference value for determining a kind of PUCCH resource set, a PUCCHresource, or the number of RBs used in actual UCI transmission in thePUCCH resource.

In addition, the reference part 2 UCI (or reference part 2 CSI) valuemay be a value assuming that rank=1, or a minimum value or a maximumvalue that the part 2 UCI (or part 2 CSI) can have.

Alternatively, the reference part 2 UCI (or reference part 2 CSI) valuemay be a fixed value described in the standard document, or a valueconfigured via RRC signaling or a combination of RRC signaling and DCI.

The meaning that it is based on the reference part 2 UCI (or referencepart 2 CSI) includes both a case where a value configured consideringthe part 2 UCI (or part 2 CSI) is linearly added to the fixed-size part1 UCI (or part 1 CSI), and a case where the value configured consideringthe part 2 UCI (or part 2 CSI) is multiplied in the scaled form.

B. Method for Determining the Number of RBs used in Actual UCITransmission in PUCCH Resource

(Method 1-B-1) is a method for determining, by the UE, a RB to transmitactual UCI in a PUCCH resource based on fixed-size part 1 UCI (or part 1CSI) and Rmax.

(Method 1-B-2) is a method for determining, by the UE, a RB to transmitactual UCI in a PUCCH resource based on fixed-size part 1 UCI (or part 1C SI), fixed-size ‘reference’ part 2 UCI (or ‘reference’ part 2 CSI),and Rmax.

The reference part 2 UCI (or reference part 2 CSI) refers to a valuethat can be configured in a range of a minimum value (e.g., 0) and amaximum value the part 2 UCI (or part 2 CSI) can have in considerationof variable-size part 2 UCI (or part 2 CSI).

That is, the reference part 2 UCI (or reference part 2 CSI) is areference value for determining a kind of PUCCH resource set, a PUCCHresource, or the number of RBs used in actual UCI transmission in thePUCCH resource.

In addition, the reference part 2 UCI (or reference part 2 CSI) valuemay be a value assuming that rank =1, or a minimum value or a maximumvalue that the part 2 UCI (or part 2 CSI) can have.

Further, the reference part 2 UCI (or reference part 2 CSI) value may bea fixed value described in the standard document, or a value configuredvia RRC signaling or a combination of RRC signaling and DCI.

The meaning that it is based on the reference part 2 UCI (or referencepart 2 CSI) includes both a case where a value configured consideringthe part 2 UCI (or part 2 CSI) is linearly added to the fixed-size part1 UCI (or part 1 CSI), and a case where the value configured consideringthe part 2 UCI (or part 2 CSI) is multiplied in the scaled form.

(Method 1-B-3) is a method for determining, by the UE, a RB to transmitactual UCI in a PUCCH resource based on the total number of bits addingmaximum values of fixed-size part 1 UCI (or part 1 CSI) andvariable-size part 2 UCI (or variable-size part 2 CSI), or based on amaximum value of total UCI (part 1+part 2) payload size and Rmax.

Further, the gNB may be blind detected by assuming the above methods.

(Method 2)

This is a method for the case where multiple UCI is transmitted onlarge-payload long PUCCH configured for CSI report (i.e., a case whereHARQ-ACK resource cannot be indicated via DCI).

A. Method for Determining PUCCH Resource

(Method 2-A-1) is a method for determining, by the UE, a PUCCH resourcebased on fixed-size part 1 UCI (or part 1 CSI), or the fixed-size part 1UCI (or part 1 CSI) and Rmax.

(Method 2-A-2) is a method for determining, by the UE, a PUCCH resourcebased on fixed-size part 1 UCI (or part 1 CSI) and fixed-size‘reference’ part 2 UCI (or ‘reference’ part 2 CSI), or fixed-size part 1UCI (or part 1 CSI), fixed-size ‘reference’ part 2 UCI (or ‘reference’part 2 CSI), and Rmax.

In this instance, the reference part 2 UCI (or reference part 2 CSI)refers to a value that can be configured in a range of a minimum value(e.g., 0) and a maximum value the part 2 UCI (or part 2 CSI) can have inconsideration of variable-size part 2 UCI (or part 2 CSI).

That is, the reference part 2 UCI (or reference part 2 CSI) is areference value for determining a kind of PUCCH resource set, a PUCCHresource, or the number of RBs used in actual UCI transmission in thePUCCH resource.

Further, the reference part 2 UCI (or reference part 2 CSI) value may bea value assuming that rank=1, or a minimum value or a maximum value thatthe part 2 UCI (or part 2 CSI) can have.

In addition, the reference part 2 UCI (or reference part 2 CSI) valuemay be a fixed value described in the standard document, or a valueconfigured via RRC signaling or a combination of RRC signaling and DCI.

The meaning that it is based on the reference part 2 UCI (or referencepart 2 CSI) includes both a case where a value configured consideringthe part 2 UCI (or part 2 CSI) is linearly added to the fixed-size part1 UCI (or part 1 CSI), and a case where the value configured consideringthe part 2 UCI (or part 2 CSI) is multiplied in the scaled form.

B. Method for Determining the Number of RBs used in Actual UCITransmission in PUCCH Resource

(Method 2-B-1) is a method for determining, by the UE, a RB to transmitactual UCI in a PUCCH resource based on fixed-size part 1 UCI (or part 1CSI) and Rmax.

(Method 2-B-2) is a method for determining, by the UE, a RB to transmitactual UCI in a PUCCH resource based on fixed-size part 1 UCI (or part 1CSI), fixed-size ‘reference’ part 2 UCI (or ‘reference’ part 2 CSI), andRmax.

In this instance, the reference part 2 UCI (or reference part 2 CSI)refers to a value that can be configured in a range of a minimum value(e.g., 0) and a maximum value the part 2 UCI (or part 2 CSI) can have inconsideration of variable-size part 2 UCI (or part 2 CSI).

That is, the reference part 2 UCI (or reference part 2 CSI) is areference value for determining a kind of PUCCH resource set, a PUCCHresource, or the number of RBs used in actual UCI transmission in thePUCCH resource.

In addition, the reference part 2 UCI (or reference part 2 CSI) valuemay be a value assuming that rank=1, or a minimum value or a maximumvalue that the part 2 UCI (or part 2 CSI) can have.

In addition, the reference part 2 UCI (or reference part 2 CSI) valuemay be a fixed value described in the standard document, or a valueconfigured via RRC signaling or a combination of RRC signaling and DCI.

The meaning that it is based on the reference part 2 UCI (or referencepart 2 CSI) includes both a case where a value configured consideringthe part 2 UCI (or part 2 CSI) is linearly added to the fixed-size part1 UCI (or part 1 CSI), and a case where the value configured consideringthe part 2 UCI (or part 2 CSI) is multiplied in the scaled form.

(Method 2-B-3) is a method for determining, by the UE, a RB to transmitactual UCI in a PUCCH resource based on the total number of bits addingmaximum values of fixed-size part 1 UCI (or part 1 CSI) andvariable-size part 2 UCI (or variable-size part 2 CSI), or based on amaximum value of total UCI (part 1+part 2) payload size and Rmax.

Further, the gNB may be blind detected by assuming the above methods.

In the above-described methods, “fixed-size part 1 UCI (or part 1 CSI)and fixed-size ‘reference’ part 2 UCI (or ‘reference’ part 2 CSI)” maymean “the total number of bits or total payload size adding fixed-sizepart 1 UCI (or part 1 CSI) and fixed-size ‘reference’ part 2 UCI (or‘reference’ part 2 C SI)”.

Further, in the above-described methods, more specifically, “PUCCHresource (set) or RB is determined based on UCI (or CSI) and Rmax” maymean that “determining resource (set) or RB consisting of a minimumnumber of REs capable of transmitting the number of coded bits based onUCI (or CSI) and Rmax”.

In addition, in the above-described methods, the part 1 UCI may includeHARQ-ACK and/or SR.

In the above methods, in case of HARQ-ACK PUCCH resource set, a RB totransmit actual UCI may be configured per UCI payload size range.

In the Case 2, assuming that the number of PUCCH resources configuredvia the higher layer signaling is Nr, the UE can determine a PUCCHresource through the following operation.

The UE arranges the Nr PUCCH resources in ascending order based on thenumber N_(RE) of REs that are capable of the PUCCH transmission in eachPUCCH resource.

That is, the UE configures an index of a PUCCH resource having thesmallest number of REs to a smallest value and configures an index of aPUCCH resource having the largest number of REs to a largest value.

It is assumed that an i-th PUCCH resource among the PUCCH resourcesarranged in ascending order of N_(REA), where i=1, . . . ,Nr.

[Equation 7]

N_(RE,J)≥N_p/Rmax/Qm

In this case, the UE can select a PUCCH resource corresponding to aminimum value N_(REJ,min) among N_(REj) values satisfying the aboveEquation 7.

The above Equation 7 represents the same meaning as Equation 5 andEquation 6 mentioned above.

If N_(RE) is the same for different PUCCH resources, the UE can select aPUCCH resource based on Rmax and/or PUCCH format.

For example, after the UE preferentially attempts to select the PUCCHresource based on the Rmax, the UE can select the PUCCH resource basedon the PUCCH format if the Rmax is still the same.

Alternatively, if the Rmax is allowed to be differently configured forthe same PUCCH format, that is, if the Rmax is not limited to beconfigured per PUCCH format, the UE may preferentially select the PUCCHresource based on the PUCCH format and select the PUCCH resource throughthe comparison of Rmax if the PUCCH format is the same.

The selection based on the Rmax described above may mean that the Rmaxselects a large PUCCH resource in terms of resource efficiency.

In this case, the UE can transmit more UCI payload bits to the basestation on the same number of REs.

Alternatively, the selection based on the Rmax may mean that the Rmaxselects a small PUCCH resource in terms of performance (e.g., coverage,etc.).

In this case, the UE can obtain an effect to increase a receptionprobability at the gNB through relatively small UCI payload bits for thesame number of REs, or expand and transmit UCI coverage.

Further, the selection based on the PUCCH format described above mayhave the following two meanings.

First, a PUCCH format with a small number of symbols constituting thePUCCH may be preferentially selected in terms of latency or the like, ora PUCCH format with a large number of symbols constituting the PUCCH maybe preferentially selected in terms of time diversity.

Second, a PUCCH format with large multiplexing capacity may bepreferentially selected.

Alternatively, the above two methods may be sequentially considered.

For example, after the first method is preferentially consideredprioritizing the latency or the time diversity, the second method may beconsidered if the number of symbols constituting the PUCCH format isstill the same.

Alternatively, after the second method is preferentially consideredprioritizing the multiplexing capacity, the first method may beconsidered if the multiplexing capacity of the PUCCH format is still thesame.

For the Case 2, the UE may align the Nr PUCCH resources in ascendingorder of max UCI payload size (N_p_max) considering the Rmax to selectone of a plurality of PUCCH resources, instead of arranging the Nr PUCCHresources in ascending order of the number NiE of REs that are capableof the PUCCH transmission of each PUCCH resource.

In this instance, for example, N_p_max may be N_(RE)·Rmax·Qm.

If an index representing an order aligned in ascending order is called j(j=1≠Nr), and a max UCI payload size of a j-th PUCCH resource aligned inascending order is called N_p_maxj (e.g., N_pmax,j=N_(REl)·Rmax_(j)·Qm), the UE can select a PUCCH resourcecorresponding to a minimum value N_p_maxjmin among N_p_maxj value(s)satisfying N_p N≤N_p_maxj.

If N_p_max is the same for different PUCCH resources, the UE can selecta PUCCH resource based on Rmax and/or PUCCH format.

For example, after the UE preferentially attempts to select the PUCCHresource based on the Rmax, the UE can select the PUCCH resource basedon the PUCCH format if the Rmax is still the same.

Alternatively, if the Rmax is allowed to be differently configured forthe same PUCCH format, that is, if the Rmax is not limited to beconfigured per PUCCH format, the UE may preferentially select the PUCCHresource based on the PUCCH format and select the PUCCH resource throughthe comparison of Rmax when the PUCCH format is the same.

Alternatively, for the case of preferentially considering the PUCCHformat, if the PUCCH format is the same when the Rmax is configured perPUCCH format, the Rmax may be the same.

Therefore, the UE can select the PUCCH resource based on only the PUCCHformat.

The selection based on the Rmax described above may mean that the Rmaxselects a large PUCCH resource in terms of resource efficiency.

In this case, the UE can transmit more UCI payload bits on the samenumber of REs.

Alternatively, the selection based on the Rmax may mean that the Rmaxselects a small PUCCH resource in terms of performance (e.g., coverage,etc.).

In this case, the UE can obtain an effect to increase a receptionprobability at the gNB using relatively small UCI payload bits for thesame number of REs, or expand and transmit UCI coverage.

Further, the selection based on the PUCCH format described above mayhave the following two meanings.

First, a PUCCH format with a small number of symbols constituting thePUCCH may be preferentially selected in terms of latency or the like, ora PUCCH format with a large number of symbols constituting the PUCCH maybe preferentially selected in terms of time diversity.

Second, a PUCCH format with large multiplexing capacity may bepreferentially selected.

Alternatively, the above two methods may be sequentially considered.

For example, after the first method is preferentially consideredprioritizing the latency or the time diversity, the second method may beconsidered if the number of symbols constituting the PUCCH format isstill the same.

Alternatively, after the second method is preferentially consideredprioritizing the multiplexing capacity, the first method may beconsidered if the multiplexing capacity of the PUCCH format is still thesame.

In addition to the above methods, it is a need to prescribe a UEbehaviour when in multiple UCI transmissions using the long PUCCH, a CSIreport generated based on the configured long PUCCH for CSI reportcannot be applied to a long PUCCH format indicated by a HARQ-ACKresource indicator or the like of DL DCI field at a corresponding CSIreport timing as it is.

For example, the CSI report may have different configurations ordifferent CSI generation methods for a wideband mode and a subband modeas follows.

In case of Wideband Mode

A CSI reporting resource can be configured for both a large-payloadshort PUCCH and a large-payload long PUCCH, and single or joint encodingis applied to generated CSI bits (zero-padded depending on the situationand made to a fixed size).

In Case of Subband Mode

A CSI reporting resource can be configured for only a large-payload longPUCCH, and separate coding is applied to part 1 CSI (fixed size) andpart 2 CSI (variable size) which are two generated CSI parts.

When the UE is instructed to transmit multiple UCI on the large-payloadshort PUCCH, that does not support subband mode CSI reporting, via DLDCI at a CSI report timing in a state where a large-payload long PUCCHformat for the above-described subband mode CSI reporting is configuredto the UE, the UE behaviour in the following Method 3 is described.

The following UE behaviour for the above cases is proposed.

(Method 3)

It is a method for the case where a CSI report generated based on aconfigured long PUCCH for a CSI report cannot be applied to a PUCCHresource indicated via DCI as it is (in the above example).

(Method 3-1) The UE drops part 2 CSI (in a state of maintaining thesubband mode) and (single or joint encoding) transmits only HARQ-ACK (orHARQ-ACK and SR) and part 1 CSI on a large-payload short PUCCH indicatedvia DCI.

The Method 3-1 is an operation of simply dropping a part of the CSIreport generated based on the long PUCCH configured for the CSI report,and thus is advantageous in terms of processing time or complexity.

However, when a payload size of the part 1 CSI generated based on thesubband mode is greater than a wideband CSI payload size, there may be aneed to allocate additional RE and/or RB and/or PUCCH symbol or thelike, and there may be a risk of exceeding a transmission capacity ofthe large-payload short PUCCH indicated via DCI.

In this instance, when the transmission capacity is exceed, the UE mayapply a part 1 CSI dropping rule, transmit only a part of the part 1 CSIor drop all the part 1 CSI according to a priority rule, and transmitonly the HARQ-ACK (or HARQ-ACK and SR) on the large-payload short PUCCHindicated via DCI.

When a payload of the HARQ-ACK (or HARQ-ACK and SR) is small, the UE mayfallback the HARQ-ACK (or HARQ-ACK and SR) to a small-payload shortPUCCH.

(Method 3-2) The UE single or jointly encodes HARQ-ACK (or HARQ-ACK andSR) and the wideband mode CSI (dynamically switching to the widebandmode) and transmits them on a large-payload short PUCCH indicated viaDCI.

Because the Method 3-2 has to generate wideband or subband mode CSIbased on a PUCCH format dynamically indicated via DCI, there is noallocation of additional RE and/or RB and/or PUCCH symbol or the like,or no risk of exceeding a capacity of the short PUCCH in the Method 3-1.But, in the Method 3-2, the high cost is required in processing time orcomplexity, etc. of a CSI report generation process.

In particular, considering the processing time, the Method 3-2 mayinclude the following operation.

The UE may generate both subband mode CSI and wideband mode CSI in theabove case (i.e., the case where subband mode CSI and large-payload longPUCCH format for CSI reporting for this are configured to the UE), andtransmit the wideband mode CSI if the large-payload short PUCCH isindicated via DCI, and otherwise transmit the subband mode CSI.

(Method 3-3) The UE drops all of CSI and transmits only HARQ-ACK (orHARQ-ACK and SR) on a large-payload short PUCCH indicated via DCI.

When a payload of the HARQ-ACK (or HARQ-ACK and SR) is small, the UE mayfallback the HARQ-ACK (or HARQ-ACK and SR) to a small-payload shortPUCCH.

(Method 3-4) The UE separately encodes {HARQ-ACK (or HARQ-ACK andSR)+part 1 CSI} and part 2 CSI (except in this case although a PUCCHresource has been indicated via DCI) and transmits them on alarge-payload long PUCCH configured for CSI report.

In the above methods, the large-payload long PUCCH may include a PUCCHformat classification at the beginning.

In this instance, the PUCCH format classification may be performed basedon, for example, a large-payload long PUCCH and a medium-payload longPUCCH (with or without multiplexing capacity).

The respective embodiments or the respective methods mentioned above maybe separately performed, and methods proposed by the presentspecification can be implemented through a combination of one or moreembodiments or a combination of one or more methods.

FIG. 8 is a flowchart illustrating an operation method of a UEperforming a method proposed by the present specification.

More specifically, FIG. 8 illustrates an operation method of a UE fortransmitting multiple uplink control information (UCI) on a physicaluplink control channel (PUCCH) in a wireless communication system.

First, the UE receives, from a base station, control information relatedto PUCCH resources for transmitting the multiple UCI in S810.

The control information may include information related to a number ofREs of the PUCCH resources, information related to a modulation order,and information related to a configured maximum code rate.

Next, the UE compares a value obtained by multiplying the configuredmaximum code rate and the modulation order by the number of REscorresponding to the PUCCH resources indexed in ascending order with asize of a payload for the multiple UCI to determine a PUCCH resource fortransmitting the multiple UCI in S820.

Next, the UE transmits, to the base station, the multiple UCI on thedetermined PUCCH resource in S830.

The step S820 may be to determine, as the PUCCH resource fortransmitting the multiple UCI, a PUCCH resource with a lowest indexamong PUCCH resources corresponding to the number of REs having a valueequal to or greater than the size of the payload for the multiple UCIamong values obtained by multiplying the configured maximum code rateand the modulation order by the number of REs corresponding to the PUCCHresources indexed in the ascending order.

In this instance, the control information may further include a PUCCHformat of the PUCCH resources, and the maximum code rate may bedetermined by the PUCCH format.

The step S820 may determine the PUCCH resource based on the maximum coderate or the PUCCH format when the PUCCH resource with the lowest indexamong the PUCCH resources corresponding to the number of REs having thevalue equal to or greater than the size of the payload for the multipleUCI among the values obtained by multiplying the configured maximum coderate and the modulation order by the number of REs corresponding to thePUCCH resources indexed in the ascending order is in plural.

The step S820 may determine the PUCCH resources based on the PUCCHformat when the PUCCH resource with the lowest index among the PUCCHresources corresponding to the number of REs having the value equal toor greater than the size of the payload for the multiple UCI among thevalues obtained by multiplying the configured maximum code rate and themodulation order by the number of REs corresponding to the PUCCHresources indexed in the ascending order is in plural and maximum coderates of the plurality of PUCCH resources are the same.

The step S820 may determine the PUCCH resources based on the maximumcode rate when the PUCCH resource with the lowest index among the PUCCHresources corresponding to the number of REs having the value equal toor greater than the size of the payload for the multiple UCI among thevalues obtained by multiplying the configured maximum code rate and themodulation order by the number of REs corresponding to the PUCCHresources indexed in the ascending order is in plural and PUCCH formatsof the plurality of PUCCH resources are the same.

In this instance, the PUCCH resources for transmitting the multiple UCImay be resources for reporting channel state information (CSI).

With reference to FIGS. 8, 10 and 11, a description in whichtransmission of multiple uplink control information (UCI) on a physicaluplink control channel (PUCCH) in a wireless communication systemproposed by the present specification is implemented by a user equipment(UE) is given.

A UE for transmitting multiple uplink control information (UCI) on aphysical uplink control channel (PUCCH) in a wireless communicationsystem may include a radio frequency

(RF) module for transmitting and receiving a radio signal; and aprocessor functionally connected to the RF module.

First, the processor of the UE controls the RF module so that theprocessor receives, from a base station, control information related toa PUCCH resource for transmitting the multiple UCI.

In this instance, the control information may include informationrelated to a number of REs of the PUCCH resource, information related toa modulation order, and information related to a configured maximum coderate.

The processor compares a value obtained by multiplying the configuredmaximum code rate and the modulation order by the number of REscorresponding to the PUCCH resources indexed in ascending order with asize of a payload for the multiple UCI to determine a PUCCH resource fortransmitting the multiple UCI.

The processor may determine, as the PUCCH resource for transmitting themultiple UCI, a PUCCH resource with a lowest index among PUCCH resourcescorresponding to the number of REs having a value equal to or greaterthan the size of the payload for the multiple UCI among values obtainedby multiplying the configured maximum code rate and the modulation orderby the number of REs corresponding to the PUCCH resources indexed in theascending order.

In this instance, the control information may further include a PUCCHformat of the PUCCH resources, and the maximum code rate may bedetermined by the PUCCH format.

The processor may determine the PUCCH resource based on the maximum coderate or the PUCCH format when the PUCCH resource with the lowest indexamong the PUCCH resources corresponding to the number of REs having thevalue equal to or greater than the size of the payload for the multipleUCI among the values obtained by multiplying the configured maximum coderate and the modulation order by the number of REs corresponding to thePUCCH resources indexed in the ascending order is in plural.

The processor controls the RF module so that the processor transmits, tothe base station, the multiple UCI on the determined PUCCH resource.

FIG. 9 is a flowchart illustrating an operation method of a base stationperforming a method proposed by the present specification.

More specifically, FIG. 9 illustrates an operation method of a basestation for receiving multiple uplink control information (UCI) on aphysical uplink control channel (PUCCH) in a wireless communicationsystem.

First, the base station transmits, to a UE, control information relatedto a PUCCH resource for transmitting the multiple UCI in S910.

In this instance, the control information may include informationrelated to a number of REs of the PUCCH resource, information related toa modulation order, and information related to a configured maximum coderate.

Next, the base station receives, from the UE, the multiple UCI on adetermined PUCCH resource in S920.

In this instance, the determined PUCCH resource may be a PUCCH resourcedetermined by comparing a value obtained by multiplying the configuredmaximum code rate and the modulation order by the number of REscorresponding to the PUCCH resources indexed in ascending order with asize of a payload for the multiple UCI.

With reference to FIGS. 9 to 11, a description in which reception ofmultiple uplink control information (UCI) on a physical uplink controlchannel (PUCCH) in a wireless communication system in the presentspecification is implemented by a base station is given.

A base station for receiving multiple uplink control information (UCI)on a physical uplink control channel (PUCCH) in a wireless communicationsystem may include a radio frequency (RF) module for transmitting andreceiving a radio signal; and a processor functionally connected to theRF module.

First, the processor of the base station controls the RF module so thatthe processor transmits, to a UE, control information related to a PUCCHresource for transmitting the multiple UCI.

In this instance, the control information may include informationrelated to a number of REs of the PUCCH resource, information related toa modulation order, and information related to a configured maximum coderate.

The processor controls the RF module so that the processor receives,from the UE, the multiple UCI on a determined PUCCH resource.

In this instance, the determined PUCCH resource may be a PUCCH resourcedetermined by comparing a value obtained by multiplying the configuredmaximum code rate and the modulation order by the number of REscorresponding to the PUCCH resources indexed in ascending order with asize of a payload for the multiple UCI.

The methods mentioned above may be independently performed, or may bevariously coupled or combined and performed.

Overview of Device to which the Present Invention is Applicable

FIG. 10 illustrates an example of a block configuration diagram of awireless communication device to which methods proposed by the presentspecification are applicable.

Referring to FIG. 10, a wireless communication system includes a basestation 1010 and multiple UEs 1020 positioned in a region of the basestation.

Each of the base station 1010 and the UE 1020 may be represented by aradio device.

The base station 1010 includes a processor 1011, a memory 1012, and aradio frequency (RF) unit 1013. The processor 1011 implements functions,processes, and/or methods proposed in FIGS. 1 to 9. Layers of radiointerface protocol may be implemented by the processor. The memory 1012is connected to the processor 1011 and stores various types ofinformation for driving the processor 1011. The RF unit 1013 isconnected to the processor 1011 and transmits and/or receives radiosignals.

The UE 1020 includes a processor 1021, a memory 1022, and a RF unit1023.

The processor 1021 implements functions, processes, and/or methodsproposed in FIGS. 1 to 9. Layers of radio interface protocol may beimplemented by the processor. The memory 1022 is connected to theprocessor 1021 and stores various types of information for driving theprocessor 1021. The RF unit 1023 is connected to the processor 1021 andtransmits and/or receives radio signals.

The memories 1012 and 1022 may be inside or outside the processors 1011and 1021 and may be connected to the processors 1011 and 1021 throughvarious well-known means.

Further, the base station 1010 and/or the UE 1020 may have a singleantenna or multiple antennas.

FIG. 11 illustrates another example of a block configuration diagram ofa wireless communication device to which methods proposed by the presentspecification are applicable.

Referring to FIG. 11, a wireless communication system includes a basestation 1110 and multiple UEs 1120 positioned in a region of the basestation. The base station 1110 may be represented by a transmitter, andthe UE 1120 may be represented by a receiver, or vice versa. The basestation 1110 and the UE 1120 respectively include processors 1111 and1121, memories 1114 and 1124, one or more Tx/Rx RF modules 1115 and1125, Tx processors 1112 and 1122, Rx processors 1113 and 1123, andantennas 1116 and 1126. The processors implement functions, processes,and/or methods mentioned above. More specifically, in DL (communicationfrom the base station to the UE), an upper layer packet from a corenetwork is provided to the processor 1111. The processor implementsfunctionality of the L2 layer. In the DL, the processor providesmultiplexing between a logical channel and a transport channel and radioresource allocation to the UE 1120 and is also responsible for signalingto the UE 1120.

The transmit (Tx) processor 1112 implements various signal processingfunctions for the L1 layer (i.e., physical layer). The signal processingfunctions include coding and interleaving to facilitate forward errorcorrection (FEC) at the UE. The coded and modulated symbols are splitinto parallel streams, and each stream is mapped to an OFDM subcarrier,multiplexed with a reference signal (RS) in time and/or frequencydomain, and combined together using an Inverse Fast Fourier Transform(IFFT) to produce a physical channel carrying a time domain OFDMA symbolstream. The OFDMA stream is spatially precoded to produce multiplespatial streams. Each spatial stream may be provided to the differentantenna 1116 via a separate Tx/Rx module (or transceiver 1115). EachTx/Rx module may modulate an RF carrier with a respective spatial streamfor transmission. At the UE, each Tx/Rx module (or transceiver 1125)receives a signal through the respective antenna 1126 of each Tx/Rxmodule. Each Tx/Rx module recovers information modulated onto an RFcarrier and provides the information to the receive (Rx) processor 1123.The RX processor implements various signal processing functions of theLayer 1. The Rx processor may perform spatial processing on theinformation to recover any spatial stream destined for the UE. Ifmultiple spatial streams are destined for the UE, they may be combinedinto a single OFDMA symbol stream by the multiple Rx processors. The Rxprocessor converts the OFDMA symbol stream from the time domain to thefrequency domain using a Fast Fourier Transform (FFT). The frequencydomain signal includes a separate OFDMA symbol stream for eachsubcarrier of the OFDM signal. The symbols on each subcarrier and thereference signal are recovered and demodulated by determining the mostlikely signal constellation points transmitted by the base station.These soft decisions may be based on channel estimation values. The softdecisions are decoded and deinterleaved to recover data and controlsignals that were originally transmitted by the base station on thephysical channel. The corresponding data and control signals areprovided to the processor 1121.

UL (communication from the UE to the base station) is processed at thebase station 1110 in a manner similar to the description associated witha receiver function at the UE 1120. Each Tx/Rx module 1125 receives asignal through the respective antenna 1126. Each Tx/Rx module providesan RF carrier and information to the Rx processor 1123. The processor1121 may be associated with the memory 1124 that stores a program codeand data. The memory may be referred to as a computer readable medium.

The embodiments described above are implemented by combinations ofcomponents and features of the present invention in predetermined forms.Each component or feature should be considered selectively unlessspecified separately. Each component or feature may be carried outwithout being combined with another component or feature. Moreover, somecomponents and/or features are combined with each other and canimplement embodiments of the present invention. The order of operationsdescribed in embodiments of the present invention may be changed. Somecomponents or features of one embodiment may be included in anotherembodiment, or may be replaced by corresponding components or featuresof another embodiment. It will be apparent that some claims referring tospecific claims may be combined with another claims referring to theother claims other than the specific claims to constitute the embodimentor add new claims by means of amendment after the application is filed.

Embodiments of the present invention can be implemented by variousmeans, for example, hardware, firmware, software, or combinationsthereof. When embodiments are implemented by hardware, one embodiment ofthe present invention can be implemented by one or more applicationspecific integrated circuits (ASICs), digital signal processors (DSPs),digital signal processing devices (DSPDs), programmable logic devices(PLDs), field programmable gate arrays (FPGAs), processors, controllers,microcontrollers, microprocessors, and the like.

When embodiments are implemented by firmware or software, one embodimentof the present invention can be implemented by modules, procedures,functions, etc. performing functions or operations described above.Software code can be stored in a memory and can be driven by aprocessor. The memory is provided inside or outside the processor andcan exchange data with the processor by various well-known means.

While the present invention has been described and illustrated hereinwith reference to the preferred embodiments thereof, it will be apparentto those skilled in the art that various modifications and variationscan be made therein without departing from the spirit and scope of thepresent invention. Thus, it is intended that the present inventioncovers the modifications and variations of this invention that comewithin the scope of the appended claims and their equivalents.

The present specification has an effect of efficiently using resourcesby providing a method for transmitting multiple uplink controlinformation (UCI) on a physical uplink control channel (PUCCH).

The present specification also has an effect of efficiently selectingresources by providing a method for determining for a PUCCH resource fortransmitting UCI based on information about a number of REs related tothe PUCCH resource, a maximum code rate, a modulation order, and thelike.

Effects that can be obtained by the present invention are not limited bythe effects mentioned above, and other effects which are not mentionedabove can be clearly understood from the following description by thoseskilled in the art to which the present invention pertains.

Although the present invention has been described focusing on examplesapplying to the 3GPP LTE/LTE-A/NR system, it can be applied to variouswireless communication systems other than the 3GPP LTE/LTE-A/NR system.

What is claimed is:
 1. A method for transmitting, by a user equipment (UE), multiple uplink control information (UCI) on a physical uplink control channel (PUCCH) in a wireless communication system, the method comprising: receiving, from a base station (BS), control information related to a plurality of PUCCH resources for transmitting the multiple UCI, wherein the control information includes information related to a number of REs of the plurality of the PUCCH resources, information related to a modulation order, and information related to a maximum code rate; determining, a PUCCH resource for the multiple UCI transmission among the plurality of the PUCCH resources, wherein the PUCCH resource is determined by comparing a size of the multiple payload for the multiple UCI with values, wherein the values are obtained by multiplying the maximum code rate, the modulation order and the number of REs; and transmitting, to the BS, the multiple UCI on the PUCCH resource, wherein the multiple UCI includes at least of hybrid automatic repeat request-acknowledgement (HARQ-ACK), scheduling request (SR) or channel state information (CSI).
 2. The method of claim 1, wherein the PUCCH resource is determined by the values equal to or greater than the size of the payload for the multiple UCI.
 3. The method of claim 1, wherein the REs correspond to the plurality of the PUCCH resources indexed in ascending order.
 4. The method of claim 3, wherein an index of the PUCCH resource is a lowest index among the REs satisfying the values.
 5. The method of claim 4, wherein the control information further includes a PUCCH format of the plurality of the PUCCH resources, and the maximum code rate is determined by the PUCCH format.
 6. The method of claim 5, wherein the PUCCH resource is determined based on the maximum code rate or the PUCCH format, when the lowest indexed PUCCH resources are in plural.
 7. The method of claim 5, wherein the PUCCH resource is determined based on the PUCCH format, when the lowest indexed PUCCH resources are in plural and maximum code rate of the plurality of lowest indexed PUCCH resources are same.
 8. The method of claim 5, wherein the PUCCH resource is determined based on the maximum code rate, when the lowest indexed PUCCH resources are in plural and PUCCH format of the plurality of lowest indexed PUCCH resources are same.
 9. A user equipment (UE) for transmitting multiple uplink control information (UCI) on a physical uplink control channel (PUCCH) in a wireless communication system, the UE comprising: a radio frequency (RF) module configured to transmit and receive a radio signal; and a processor functionally connected to the RF module, wherein the processor is configured to: receive, from a base station (BS), control information related to a plurality of PUCCH resources for transmitting the multiple UCI, wherein the control information includes information related to a number of REs of the plurality of the PUCCH resources, information related to a modulation order, and information related to a maximum code rate; determine, a PUCCH resource for the multiple UCI transmission among the plurality of the PUCCH resources, wherein the PUCCH resource is determined by comparing a size of the multiple payload for the multiple UCI with values, wherein the values are obtained by multiplying the maximum code rate, the modulation order and the number of REs; and transmit, to the BS, the multiple UCI on the PUCCH resource, wherein the multiple UCI includes at least of hybrid automatic repeat request-acknowledgement (HARQ-ACK), scheduling request (SR) or channel state information (CSI).
 10. The method of claim 9, wherein the PUCCH resource is determined by the values equal to or greater than the size of the payload for the multiple UCI.
 11. The method of claim 9, wherein the REs correspond to the plurality of the PUCCH resources indexed in ascending order.
 12. The method of claim 11, wherein an index of the PUCCH resource is a lowest index among the REs satisfying the values.
 13. The method of claim 12, wherein the control information further includes a PUCCH format of the plurality of the PUCCH resources, and the maximum code rate is determined by the PUCCH format.
 14. The method of claim 13, wherein the PUCCH resource is determined based on the maximum code rate or the PUCCH format, when the lowest indexed PUCCH resources are in plural.
 15. The method of claim 13, wherein the PUCCH resource is determined based on the PUCCH format, when the lowest indexed PUCCH resources are in plural and maximum code rate of the plurality of lowest indexed PUCCH resources are same.
 16. The method of claim 13, wherein the PUCCH resource is determined based on the maximum code rate, when the lowest indexed PUCCH resources are in plural and PUCCH format of the plurality of lowest indexed PUCCH resource are same.
 17. A method for receiving, by a base station, multiple uplink control information (UCI) on a physical uplink control channel (PUCCH) in a wireless communication system, the method comprising: transmitting, to a user equipment (UE), control information related to a plurality of PUCCH resources for transmitting the multiple UCI, wherein the control information includes information related to a number of REs of the plurality of the PUCCH resources, information related to a modulation order, and information related to a maximum code rate; receive, to the UE, the multiple UCI on the PUCCH resource, wherein the PUCCH resource is determined by comparing a size of the multiple payload for the multiple UCI with values, wherein the values are obtained by multiplying the maximum code rate, the modulation order and the number of REs; and wherein the multiple UCI includes at least of hybrid automatic repeat request-acknowledgement (HARQ-ACK), scheduling request (SR) or channel state information (CSI).
 18. The method of claim 17, wherein the PUCCH resource is determined by the values equal to or greater than the size of the payload for the multiple UCI.
 19. The method of claim 17, wherein the REs correspond to the plurality of the PUCCH resources indexed in ascending order.
 20. The method of claim 19, wherein an index of the PUCCH resource is a lowest index among the REs satisfying the values. 